Comprobaciones en Inyeccion

7/21/2019 Comprobaciones en Inyeccion

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13-1

FUELCONTENTS

MULTIPOINT INJECTION (MPI) 2. . . . . . .

GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Outline of Change 2. . . . . . . . . . . . . . . . . . . . . . . . .

SERVICE SPECIFICATIONS 4. . . . . . . . . . . . . .

SEALANT 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SPECIAL TOOLS 5. . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING 6. . . . . . . . . . . . . . . . . . . .

ON-VEHICLE SERVICE 68. . . . . . . . . . . . . . . .

Fuel Pump Resistor Check 68. . . . . . . . . . . . . . . .

Fuel Pump Relay No.2Continuity Check 68. . . . . . . . . . . . . . . . . . . . . . . . .

Engine Control Relay and Fuel Pump RelayContinuity Check 68. . . . . . . . . . . . . . . . . . . . . . . . .

FUEL SUPPLY 69. . . . . . . . . . . . . . . . . . . . .

GENERAL 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Outline of Change 69. . . . . . . . . . . . . . . . . . . . . . . .

FUEL TANK 69. . . . . . . . . . . . . . . . . . . . . . . . . . .


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MPI General13-2

MULTIPOINT INJECTION (MPI)

GENERAL

OUTLINE OF CHANGE

The descriptions of the troubleshooting using an MUT-II tester have been added. The fuel system and its management of EVOLUTION-VI are different from those of EVOLUTION-V

in the following items. Accordingly, the service procedures for these items are described herein. Theservice procedures for the remaining item are the same as those for EVOLUTION-V. Fan motor control Fuel pump drive control Fuel pump relay No.2 Fuel pump resistor Actuator test function of MUT-II (The test of the following items has been made possible.)

a) Item No.36: Secondary air control solenoid valveb) Item No.37: Air conditioner condenser fan (High)c) Item No.38: Air conditioner condenser fan (Low)


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MPI General 13-3

MPI System Diagram

1 Injector2 ISC servo3 Fuel pressure control valve4 Waste gate solenoid valve5 Secondary air control solenoid valve

Control relay Fuel pump relay

A/C relay Ignition coil Exhaust temperature warning lamp Engine warning lamp Diagnosis output Alternator G terminal Fan motor relay Tachometer Fuel pump relay No.2

1 Oxygen sensor2 Air flow sensor3 Intake air temperature sensor4 Throttle position sensor5 Idle switch6 Camshaft position sensor7 Crank angle sensor8 Barometric pressure sensor

9 High temperature sensor10 Engine coolant temperature sensor11 Detonation sensor

Power supply voltage Ignition switch-IG Ignition switch-ST Vehicle speed sensor A/C switch Power steering fluid pressure switch Alternator FR signal

Engine ECU

1 Oxygen sensor

2 Air flow sensor3Intake air tem-perature sensor

4,5

6 Camshaft positionsensor

7 Crank angle sensor

8 Barometricpressure sensor

9 High temperaturesensor

10 Coolant temperature sensor

11 Detonation sensor

1 Injector

2 ISC servo

3 Fuel pressurecontrol valve

4 Waste gatesolenoid valve

5 Secondary aircontrol solenoidvalve

Canister

Check valve

Fromfueltank

Throttle positionsensor (with abuilt-inidleswitch)

Secondaryair valve

Air

To fueltank

Fuelpressureregulator

Fromfuelpump

Waste gateactuator

Catalytic converter


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MPI Service Specifications / Sealant13-4

SERVICE SPECIFICATIONS

Items Specifications

Basic ignition timing BTDC 5 3

Basic idle speed rpm 850 50

Throttle position sensor adjusting voltage mV 400 1,000

Throttle position sensor resistance k 3.5 6.5

ISC servo coil resistance (at 20C) 28 33

Intake air temperature sensor resistance k At 20C 2.3 3.0

At 80C 0.30 0.42

Coolant temperature sensor resistance k At 20C 2.1 2.7

At 80C 0.26 0.36

Fuel pressure kPa When vacuum hose is connected 230

When vacuum hose is disconnected 289 309

Injector coil resistance 2 3

Amount of injector fuel leak drop/min 1 or less

Oxygen sensor output voltage V 0.6 1.0

Fuel pressure control valve coil resistance (at 20C) 28 36

SEALANT

Item Specified sealant Remark

Engine coolant temperature sensorthreaded portion

3M Nut Locking Part No.4171 or equivalent Drying sealant


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MPI Troubleshooting13-6

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

Refer to GROUP 00How to Use Troubleshooting/InspectionService Points.

DIAGNOSIS FUNCTION

ENGINE WARNING LAMP (CHECK ENGINE LAMP)

If an abnormality occurs in any of the following items relatedto the Multipoint Fuel Injection (MPI) system, the enginewarning lamp will illuminate.If the lamp remains illuminated or if the lamp illuminates whilethe engine is running, check the diagnosis code output.

Engine warning lamp inspection items

Engine-ECU

Air flow sensor

Intake air temperature sensor

Throttle position sensor

Engine coolant temperature sensor

Crank angle sensor

Camshaft position sensor

Barometric pressure sensor

Detonation sensorInjector

Ignition coil, power transister unit

METHOD OF READING AND ERASING DIAGNOSISCODES

Refer to GROUP 00How to Use Troubleshooting/InspectionService Points.

INSPECTION USING MUT-II DATA LIST ANDACTUATOR TESTING

1. Carry out inspection by connecting the MUT-II.

If there is an abnormality, check and repair the chassisharnesses and components.2. After repairing, check that the abnormal input and output

have returned to normal as a result of the repairs.3. Erase the diagnosis code memory.4. Remove the MUT-IIand carry out a road test to confirm

that the problem has disappeared.

Engine warning lamp(check engine lamp)


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MPI Troubleshooting 13-7

FAIL-SAFE FUNCTION REFERENCE TABLE

When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlledby means of the pre-set control logic to maintain safe conditions for driving.

Malfunctioning item Control contents during malfunction

Air flow sensor 1. Uses the throttle position sensor signal and engine speed signal (crank angle sensorsignal) to take reading of the basic injector drive time and basic ignition timing from

the pre-set mapping.2. Fixes the ISC servo in the appointed position so idle control is not performed.

Intake air temperaturesensor

Controls as if the intake air temperature is 25C.

Throttle positionsensor

No increase in fuel injection amount during acceleration due to the throttle position sensorsignal.

Engine coolanttemperature sensor

1. Controls as if the engine coolant temperature is 80C.(This condition is maintained until the ignition switch is turned off even when thesensor signal returns normal.)

2. Lets the fan motor (radiator and condenser) run at high speed.

Camshaft positionsensor

Injects fuel to all cylinders simultaneously for 4 seconds.(However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is notdetected at all.)

Barometric pressuresensor

Controls as if the barometric pressure is 101 kPa.

Detonation sensor Switches the ignition timing from ignition timing for super petrol to ignition timing for standardpetrol.

Ignition coil, powertransistor unit

Cuts off the fuel supply to cylinders with an abnormal ignition.

Alternator FR terminal Does not control the output of the alternator according to an electrical load. (works as anormal alternator)


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3. INSPECTION CHART FOR DIAGNOSIS CODES

Code No. Diagnosis item Reference page

12 Air flow sensor system 13-8

13 Intake air temperature sensor system 13-9

14 Throttle position sensor system 13-9

21 Engine coolant temperature sensor system 13-10

22 Crank angle sensor system 13-11

23 Camshaft position sensor system 13-12

24 Vehicle speed sensor system 13-13

25 Barometric pressure sensor system 13-14

31 Detonation sensor system 13-15

41 Injector system 13-15

44 Ignition coil and power transistor unit system 13-16

64 Alternator FR terminal system 13-17

INSPECTION PROCEDURE FOR DIAGNOSIS CODES

Code No. 12 Air flow sensor system Probable cause

Range of Check Engine speed is 500 r/min or more.Set conditions Sensor output frequency is 3 Hz or less for 4 seconds.

Malfunction of the air flow sensor Improper connector contact, open or short-circuited

harness wire of the air flow sensor Malfunction of the engine-ECU

Measure at the air flow sensor con-nector A-25. Connect the connector. (Use

the test harness: MB991709)1. Voltage between 3 and earth

(Engine: Idling)OK: 2.23.2 V

2. Voltage between 7 and earthOK: 01 V (Engine: idling)

69 V (2,000 r/min)

OK

Replace the engine-ECU.

1. NG Check the air flow sensor circuit.(Refer to P.13-55, INSPECTIONPROCEDURE 48.)

2. NGMeasure at the engine-ECU con-nector B-59. Connect the connector. Voltage between 19 and earth

(Ignition switch: ON)OK: 69 V

OK

Check the following connector:B-59

OK

Check trouble symptom.

NG


NGCheck the following connector:A-25

NGRepair

OK


NG

NGRepair

Replace the air flow sensor.


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Code No. 13 Intake air temperature sensor system Probable cause

Range of Check Ignition switch: ON Excluding 60 seconds after the ignition switch is turned to ON or immediately

after the engine starts.Set conditions Sensor output voltage is 4.6 V or more (corresponding to an intake air temperature

of 45C or less) for 4 seconds.or Sensor output voltage is 0.2V or less (corresponding to an intake air temperature

of 125C or more) for 4 seconds.

Malfunction of the intake air temperature sensor Improper connector contact, open or short-circuited

harness wire of the intake air temperature sensor circuit Malfunction of the engine-ECU

Check the intake air temperaturesensor. (Refer to P.13-32.)*

NG

OK

Measure at the air flow sensor con-nector A-25. Disconnect the connector, and

measure at the harness side. Voltage between 6 and earth

(Ignition switch: ON)OK: 4.54.9 V

Continuity between 5 and earthOK: Continuity

NGCheck the following connector:B-62

NGRepair

OK


NG

Check the harness wire between

the engine-ECU and the intake airtemperature sensor connector.

NGRepair

OK


OK

Check the following connector:A-25

NGRepair

OK

Check trouble symptom.NG


Replace the air flow sensor.

NOTE*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

Code No. 14 Throttle position sensor system Probable cause

Range of Check Ignition switch: ON

Excluding 60 seconds after the ignition switch is turned to ON or immediatelyafter the engine starts.Set conditions The sensor output voltage is 0.2 V or less for 4 seconds.

Malfunction of the throttle position sensor Improper connector contact, open or short-circuited

harness wire of the throttle position sensor circuit Improper ONstate of idle position switch Short circuit of the idle position switch signal line Malfunction of the engine-ECU

MUT-IIData list26 Idle position switch system

OK: With the throttle valve at theidle position: ONWith the throttle valve slight-ly open: OFF

NGCheck the idle position switch system.(Refer to P.13-38, INSPECTION PRO-CEDURE 26.)

OK

Check the throttle position sensor.NG

Replace

OK

Measure at the throttle position sensorconnector A-16. Disconnect the connector, and




NG Check the following connector:B-62

NGRepair

OK


NG

Check the harness wire between theengine-ECU and the throttle positionsensor connector.

NGRepair

OK


OK

Check the throttle position sensor out-put circuit. (Refer to P.13-55, INSPEC-TION PROCEDURE 49.)


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Code No. 21 Engine coolant temperature sensor system Probable cause


after the engine starts.Set conditions Sensor output voltage is 4.6 V or more (corresponding to an engine coolant

temperature of 45C or less) for 4 seconds.or Sensor output voltage is 0.1 V or less (corresponding to an engine coolant

temperature of 140C or more) for 4 seconds.

Malfunction of the engine coolant temperature sensor Improper connector contact, open or short-circuited

harness wire of the engine coolant temperature sensorcircuit

Malfunction of the engine-ECU

Range of Check Ignition switch: ON Engine speed is approx. 50 r/min or moreSet conditions The sensor output voltage increases from 1.6 V or less (corresponding to an

engine coolant temperature of 40C or more) to 1.6 V or more (correspondingto an engine coolant temperature of 40C or less).

After this, the sensor output voltage is 1.6 V or more for 5 minutes.

Check the engine coolant temperaturesensor. (Refer to P.13-32.)*

NGReplace

OK

Measure at the engine coolant temper-ature sensor connector A-38. Disconnect the connector, and




NG

Check the following connector:B-62

NG

Repair

OK


NG

Check the harness wire between theengine-ECU and the engine coolanttemperature sensor connector.

NGRepair

OK


Check the following connector:

A-38

OKCheck trouble symptom.

NG


NG

Repair

OK



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Code No. 22 Crank angle sensor system Probable cause

Range of Check Engine is cranking.Set conditions Sensor output voltage does not change for 4 seconds (no pulse signal input.)

Malfunction of the crank angle sensor Improper connector contact, open or short-circuited

harness wire of the crank angle sensor Malfunction of the engine-ECU

Measure at the crank angle sensor connector A-51. Connect the connector. (Use the test harness: MD998478.)

Voltage between 2 (black clip) and earth (Engine: cranking)OK: 0.44.0 V

Voltage between 2 (black clip) and earth (Engine: idling)OK: 1.52.5 V

NG

OKReplace the engine-ECU.

Measure at the crank angle sensor connector A-51. Disconnect the connector, and measure at the harness side.1. Voltage between 3 and earth (Ignition switch: ON)

OK: System voltage2. Voltage between 2 and earth (Ignition switch: ON)

OK: 4.85.2 V3. Continuity between 1 and earth

OK: Continuity

OK

Check the following con-nector:A-51

NG

Repair

OK


NG

Replace the crank angle sensor.

1. NGCheck the harness wire between the crank angle sensor and thecontrol relay connector, and repair if necessary.

2. NGCheck the following con-nector:B-62

NGRepair

OK3. NG


NG

Check the harness wirebetween the engine-ECUand the crank angle sensorconnector.

NG Repair

OK


Check the harness wire between the crank angle sensor and theearth, and repair if necessary.


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Code No. 23 Camshaft position sensor system Probable cause

Range of Check Ignition switch: ON Engine speed is approx. 50 r/min or more.Set conditions Sensor output voltage does not change for 4 seconds (no pulse signal input.)

Malfunction of the camshaft position sensor Improper connector contact, open or short-circuited

harness wire of the camshaft position sensor circuit Malfunction of the engine-ECU

Measure at the camshaft position sensor connector A-97.

Connect the connector. Voltage between 2 and earth (Engine: cranking)

OK: 0.43.0 V Voltage between 2 and earth (Engine: idling)

OK: 0.52.0 V


NG

Measure at the camshaft position sensor connector A-97. Disconnect the connector, and measure at the harness side.1. Voltage between 3 and earth (Ignition switch: ON)


OK: 4.85.2 V3. Continuity between 1 and earth

OK: Continuity

1. NGCheck the harness wire between the camshaft position sensorand the control relay connector, and repair if necessary.

2. NGCheck the following con-nector:B-62

NGRepair

OK


NG

Check the harness wirebetween the engine-ECUand the camshaft positionsensor connector.

NGRepair

OK


3. NG

Check the harness wire between the camshaft position sensorand the earth, and repair if necessary.

OK

Check the following con-nector:A-97

NG Repair

OK


NG

Replace the camshaft position sensor.


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Code No. 24 Vehicles speed sensor system Probable cause

Range of check Ignition switch: ON Excluding 60 seconds after the ignition switch is turned to ON or immediately

after the engine starts. Idle position switch: OFF Engine speed is 3,000 r/min or more. Driving under high engine load conditions.Set conditions Sensor output voltage does not change for 4 seconds (no pulse signal input).

Malfunction of the vehicle speed sensor Improper connector contact, open or short-circuited

harness wire of the vehicle speed sensor circuit Malfunction of the engine-ECU

OK

Check the ignition switch. (Refer to GROUP 54Ignition Switch.)

2. NG

OK


3. NG

OK


NG

Check the harness wirebetween the engine-ECUand the vehicle speedsensor connector.

NGRepair

OK


OK

Check the followingconnectors:A-19, B-62

NGRepair

NG

Check the harness wire

between the engine-ECUand the vehicle speedsensor connector.

NGRepair

OK


Check the followingconnector: B-62

NGRepair

NG

Check the harness wire

between the vehiclespeed sensor and ignitionswitch connector.

NGRepair

OK


OK

Measure at the vehicle speed sensor connector A-19. Disconnect the connector, and measure at the harness

side.1. Voltage between 1 and earth (Ignition switch: ON)


OK: 4.8 5.2 V3. Continuity between 2 and earth

OK: Continuity

1. NGCheck the followingconnectors:B-64, B-74, B-76

NGRepair

Check the vehicle speed sensor. (Refer to GROUP 54Combina-tion Meters.)

NGReplace

Check the harness wire between the vehicle speed sensor andthe earth, and repair if necessary.


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Code No. 25 Barometric pressure sensor system Probable cause


after the engine starts.Set conditions Sensor output voltage is 4.5 V or more (corresponding to a barometric pressure

of 114 kPa or more) for 4 seconds.or Sensor output voltage is 0.2 V or less (corresponding to a barometric pressure

of 5.33 kPa or less) for 4 seconds.

Malfunction of the barometric pressure sensor Improper connector contact, open or short-circuited

harness wire of the barometric pressure sensor circuit Malfunction of the engine-ECU

Measure at the air flow sensor con-nector A-25. Connect the connector. (Use

the test harness: MB991709) Voltage between 2 and earth

(Ignition switch: ON)OK: 3.74.3 V (Altitude: 0 m)

3.23.8V (Altitude:1,200 m)

NGMeasure at the air flow sensor con-nector A-25. Disconnect the connector, and




NGCheck the following connector:B-62

NGRepair

OK


NG

Check the harness wire betweenthe engine-ECU and the baromet-ric pressure sensor connector.

NGRepair

OK


OK

Check the following connector:

A-25

NGRepair

OK


NG

Check the harness wire betweenthe engine-ECU and the baromet-ric pressure sensor connector.

NGRepair

OKReplace the air flow sensor.

OK

Measure at the engine-ECU con-nector B-62. Connect the connector. Voltage between 85 and earth

(Ignition switch: ON)

OK: 3.74.3 V (Altitude: 0 m)3.23.8V (Altitude:1,200 m)

NGCheck the harness wire betweenthe engine-ECU and the baromet-ric pressure sensor connector, andrepair if necessary.

Check the following connector:A-25, B-62

OK


NG


NGRepair

OK


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Code No. 31 Detonation sensor system Probable cause


after the engine starts. Engine speed is approx. 5,000 r/min or more Set conditions The change in the detonation sensor output voltage (detonation sensor peak voltage

at each 1/2 revolution of the crankshaft) is less than 0.06 V for 200 times insuccession.

Malfunction of the detonation sensor Improper connector contact, open or short-circuited

harness wire of the detonation sensor circuit Malfunction of the engine-ECU

Measure at the detonation sensor con-nector A-96. Disconnect the connector and

measure at the harness side. Continuity between 2 and earth

OK: Continuity

OKCheck the following connector:B-62

NGRepair

OK


NG

Check the harness wire between theengine-ECU and the detonation sensorconnector.

OKReplace the detonation sensor.


NG


NG

Repair

NG

Check the harness wire between thedetonation sensor and earth, and repairif necessary.

Code No. 41 Injector system Probable cause

Range of Check Engine speed is approx. 501,000 r/min The throttle position sensor output voltage is 1.15 V or less. Actuator test by MUT-II is not carried out.Set conditions Surge voltage of injector coil is not detected for 4 seconds.

Malfunction of the injector Improper connector contact, open or short-circuited

harness wire of the injector circuit Malfunction of the engine-ECU

OK


Check the harness wire between the

resistor and the injector connector, andrepair if necessary.

Check the injector control circuit.(Refer to P.13-55, INSPECTION PRO-CEDURE 50.)

OK

OK

Measure at the injector connectorsA-53, A-54, A-55, A-56 Disconnect the connector, and


(Ignition switch: ON)OK: System voltage


NGRepair

OK

Measure at the resistor connectorA-125. Disconnect the connector, and



NGCheck the harness wire between thecontrol relay and the resistor connector,and repair if necessary.

Check the injector. (Refer to P.13-34.)*Check the resistor. (Refer to P.13-34.)*

NGReplace



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Code No. 44 Ignition coil and power transistor unit system Probable cause

Range of Check Engine speed is approx. 504,000 r/min Engine is not cranking.Set conditions Abnormal rotation due to misfire is detected by crank angle sensor (Either one

of coils fails).

Malfunction of the ignition coil Improper connector contact, open or short-circuited

harness wire of the ignition primary circuit Malfunction of the engine-ECU

OK

OK


Measure at the ignition coil connectorsA-110, A-111 Disconnect the connector, and

measure at the harness.1. Voltage between 1 and earth


2. Voltage between 3 and earth(Engine: Cranking)OK: 0.54.0 V

3. Continuity between the 2 and earthOK: Continuity

1. NGCheck the following connectors:B-65, B-76

OKCheck trouble symptom.

NG

Check the harness wire between theignition coil and ignition switch connec-tor, and repair if necessary.

2. NGCheck the following connector:B-59

NGRepair

NG

Check the harness wire between theengine-ECU and ignition coil connector.


NG

Repair

3. NG

Check the harness wire between theignition coil connector and earth, andrepair if necessary.

Check the following connectors:A-110, A-111

NGRepair


NG

Check the following items. Check the spark plugs, spark plug

cables. Check the compression pressure.

NG

Repair

Check the ignition coil. (Refer toGROUP 16 IGNITION SYSTEM.)

NGReplace

OK

OK


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Code No. 64 Alternator FR terminal system Probable cause

Range of Check Engine speed is approx. 50 r/min or moreSet Conditions The input voltage from the alternator FR terminal is higher than 4.5 V for 20 seconds.

Open circuit in alternator FR terminal circuit Malfunction of the engine-ECU

Measure at the alternator connector A-05.

Connect the connector. (Use the test harness: MB991519.) Voltage between 4 (blue clip) and earth(Engine: Idling)(Radiator fan: Stopped)(Headlamp: OFF ON)(Brake lamp: OFF ON)(Rear window defogger switch: OFF ON)OK: Voltage drops 0.2 to 3.5 V


NG

Measure at the alternator connector A-05. Disconnect the connector, and measure at the harness side. Voltage between 4 and earth

(Ignition switch: ON)OK: 4.8 5.2 V

NGCheck the followingconnectors: B-60, A-88

NGRepair

OK


NG

Check the harness wirebetween the engine-ECUand the alternator con-nector.

NGRepair

OK


OK

Check the following connector: A-05

NG

RepairOK


NG

Check the harness wire between the engine-ECU and the alternatorconnector.

NGRepair

OK

Replace the alternator.


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INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptom InspectionprocedureNo.

Reference page

Communication-

Communication with all systems is impossible. 1 13-20 -

impossible. Communication with engine-ECU only is impossible. 2 13-20

Engine warninglamp and

The engine warning lamp does not illuminate right after theignition switch is turned to the ON position.

3 13-21

re a e par sThe engine warning lamp remains illuminating and never goesout.

4 13-21

Starting No initial combustion (starting impossible) 5 13-22

Initial combustion but no complete combustion(starting impossible)

6 13-23

Long time to start (improper starting) 7 13-24

Idling stability Unstable idling (Rough idling, hunting) 8 13-25mproper ngIdling speed is high. (Improper idling speed) 9 13-26

Idling speed is low. (Improper idling speed) 10 13-27

Idling stability When the engine is cold, it stalls at idling. (Die out) 11 13-28ng ne s a s

When the engine is hot, it stalls at idling. (Die out) 12 13-29

The engine stalls when starting the car. (Pass out) 13 13-30

The engine stalls when decelerating. 14 13-30

Driving Hesitation, sag or stumble 15 13-31

The feeling of impact or vibration when accelerating 16 13-31

The feeling of impact or vibration when decelerating 17 13-32

Poor acceleration 18 13-32

Surge 19 13-33

Knocking 20 13-33

Dieseling 21 13-33

Too high CO and HC concentration when idling 22 13-34

Low alternator output voltage (approx. 12.3 V) 23 13-35


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MPI Troubleshooting

Vehiclespeed

Initial accel-erator pedaldepression

Normal

Hesitation

Sag

Time

(Figure 1) (Figure 2)

Normal

Initial accel-erator pedaldepression

Idling Stumble

Time

Vehiclespeed

13-19

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Items Symptom

Starting Wont start The starter is used to crank the engine, but there is no combustion within thecylinders, and the engine wont start.

Fires up and dies There is combustion within the cylinders, but then the engine soon stalls.

Hard starting Engine starts after cranking a while.

Idling Hunting Engine speed doesnt remain constant; changes at idle.sta ty

Rough idle Usually, a judgement can be based upon the movement of the tachometerpointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.This is called rough idle.

Incorrect idle speed The engine doesnt idle at the usual correct speed.

Engine stall(Die out)

The engine stalls when the foot is taken from the accelerator pedal, regardlessof whether the vehicles is moving or not.

Engine stall(Pass out)

The engine stalls when the accelerator pedal is depressed or while it is beingused.

Driving Hesitation, Sag Hesitationis the delay in response of the vehicle speed (engine speed) thatoccurs when the accelerator is depressed in order to accelerate from the speedat which the vehicle is now traveling, or a temporary drop in vehicle speed(engine speed) during such acceleration. Serious hesitation is called sag.(Refer to Figure 1.)

Poor acceleration Poor acceleration is inability to obtain an acceleration corresponding to thedegree of throttle opening, even though acceleration is smooth, or the inabilityto reach maximum speed.

Stumble Engine speed increase is delayed when the accelerator pedal is initiallydepressed for acceleration. (Refer to Figure 2.)

Shock The feeling of a comparatively large impact or vibration when the engine isaccelerated or decelerated.

Surge This is repeated surging ahead during constant speed travel or during variablespeed travel.

Knocking A sharp sound like a hammer striking the cylinder walls during driving and whichadversely affects driving.

Stopping Run on(Dieseling)

The condition in which the engine continues to run after the ignition switch isturned to OFF. Also called Dieseling.


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INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

Communication with MUT-IIis impossible.(Communication with all systems is impossible.)

Probable cause

The cause is probably a defect in the power supply system (including earth) for thediagnosis line.

Malfunction of the diagnosis connector Malfunction of the harness wire

Measure at the diagnostic connectorB-22. Voltage between 16 and earth

OK: System voltage

NGCheck the following connectors: B-49, B-75, B-73 B-73, B-80

NGRepair

OK


Check the harness wire between thepower supply and diagnostic connector,and repair if necessary.

OK

Measure at the diagnostic connectorB-22. Continuity between 4 and earth Continuity between 5 and earth

OK: Continuity

NGCheck the earth wire, and repair if nec-essary.

OK

Replace the MUT-II.


MUT-IIcommunication with engine-ECU is impossible. Probable cause

One of the following causes may be suspected. No power supply to engine-ECU. Defective earth circuit of engine-ECU. Defective engine-ECU. Improper communication line between engine-ECU and MUT-II

Malfunction of engine-ECU power supply circuit Malfunction of engine-ECU Open circuit between immobilizer-ECU and diagnosis

connector

OK

Check the engine-ECU power supply and earth circuit.(Refer to P.13-53, INSPECTION PROCEDURE 45.)

NG

Check the harness wire between engine-ECU and diagnosis con-nector.

NGRepair

OK


Check the following connectors:B-22, B-65, B-32, B-61

NGRepair


21/70



The engine warning lamp does not illuminate right afterthe ignition switch is turned to the ON position.

Probable cause

For checking for burnt-out bulb, the engine-ECU causes the engine warning lampto illuminate for five seconds immediately after the ignition switch is turned to ON.If the engine warning lamp does not illuminate immediately after the ignition switchis turned to ON, one of the malfunctions listed at right has probably occurred.

Burnt-out bulb of the engine warning lamp Defective engine warning lamp circuit Malfunction of the engine-ECU

MUT-IIData list16 engine-ECU power supply voltage (Refer to P.13-57)

NGCheck the engine-ECU power supply and earth circuit.(Refer to P.13-53, INSPECTION PROCEDURE 45.)

OK

Measure at the engine-ECU connector B-60. Disconnect the connector, and measure at the harness side. Earth the terminal No.36. (Ignition switch: ON)

OK: The engine warning lamp illuminates.

OKCheck the followingconnector:B-60

NGRepair

OK


NG


NG

Check for burnt-out bulb.NG

Replace

OK

Measure at the combination meter connector B-08. Disconnect the connector, and measure at the harness side. Voltage between 42 and earth (Ignition switch: ON)

OK: System voltage

NGCheck the engine warning lamp power supply circuit, and repairif necessary.

OK

Check the following connectors:B-08, B-65, B-60

NGRepair

OK


Check the harness wire between combination meter and engine-ECU connector, and repair if necessary.


The engine warning lamp remains illuminating and never

goes out.

Probable cause

In cases such as the above, the cause is probably that the engine-ECU is detectinga problem in a sensor or actuator, or that one of the malfunctions listed at right hasoccurred.

Short-circuit between the engine warning lamp andengine-ECU

Malfunction of the engine-ECU

MUT-IISelf-Diag codeAre diagnosis codes displayed?

YesRefer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

No

Measure at the combination meter connector B-08. Disconnect the connector, and measure at the harness side. Disconnect the engine-ECU connector Continuity between 53 and earth

OK: No continuity

NGCheck the harness wire between combination meter and engine-ECU connector, and repair if necessary.

OK



22/70



No initial combustion (starting impossible) Probable cause

In cases such as the above, the cause is probably that a spark plug is defective,or that the supply of fuel to the combustion chamber is defective.In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.

Malfunction of the ignition system Malfunction of the fuel pump system Malfunction of the injectors Malfunction of the engine-ECU Foreign materials in fuel

Check system voltage when cranking.OK: 8 V or higher

NGCheck the battery.

OK

MUT-II: Inspection of no initial combustion.(Refer to P.13-47, INSPECTION PROCEDURE 37.)

OK

Can any sound be heard from the injectors when cranking (checkusing a soundscope)?

NGCheck the injector system. (Refer to P.13-15, INSPECTION PRO-CEDURE FOR DIAGNOSIS CODE 41.)

OK

Ignition system: Inspection of no initial combustion.(Refer to P.13-47, INSPECTION PROCEDURE 38.)

OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check if the injectors are clogged. Check if foreign materials (water, alcohol, etc.) got into fuel. Check the compression pressure.


23/70



Initial combustion but no complete combustion(starting impossible)

Probable cause

In such cases as the above, the cause is probably that the spark plugs are generatingsparks but the sparks are weak, or the initial mixture for starting is not appropriate.

Malfunction of the ignition system Malfunction of the injector system Foreign materials in fuel Poor compression Malfunction of the engine-ECU

Check system voltage when cranking.OK: 8 V or higher

NGCheck the battery.

OK

MUT-II: Check if uncompleted combustion occurs.(Refer to P.13-48, INSPECTION PROCEDURE 39.)

OK


NGCheck the injector system, (Refer to P.13-15, INSPECTION PRO-CEDURE FOR DIAGNOSIS CODE 41.)

OK

Is starting good if the engine is cranked with the accelerator pedalslightly depressed?

YesCheck ISC servo for op-eration sound.

NGCheck the ISC servo sys-tem. (Refer to P.13-44, IN-

SPECTION PROCE-DURE 33.)

OK

Clean the throttle valve area. Adjust the fixed SAS. (Refer to P.13-30.)*

No

Check the ignition timing when cranking.OK: Approx. 5BTDC

NGCheck that the crank angle sensor and the timing belt cover areinstalled properly.

OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the injectors for clogging and leakage. Check the compression pressure. Check fuel lines for clogging.

Check if foreign materials (water, alcohol, etc.) got into fuel.



24/70



Long time to start (Improper starting) Probable cause

In cases such as the above, the cause is probably that the spark is weak and ignitionis difficult, the initial mixture for starting is not appropriate, or sufficient compressionpressure is not being obtained.

Malfunction of the ignition system Malfunction of the injector system Inappropriate gasoline use Poor compression

Check system voltage when crankingOK: 8 V or higher

NG

Check the battery.

OK

MUT-II: Check if uncomplete combustion occurs.(Refer to P.13-48, INSPECTION PROCEDURE 39.)

OK


NGCheck the injector system. (Refer to P.13-15, INSPECTION PRO-CEDURE FOR DIAGNOSIS CODE 41.)

OK



OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the injectors for clogging and leakage. Check the compression pressure. Check if foreign materials (water, alcohol, etc.) got into fuel.


25/70



Unstable idling (Rough idling, hunting) Probable cause

In cases as the above, the cause is probably that the ignition system, air/fuel mixture,idle speed control (ISC) or compression pressure is defective.Because the range of possible causes is broad, inspection is narrowed down to simpleitems.

Malfunction of the ignition system Malfunction of air-fuel ratio control system Malfunction of the ISC servo system Poor compression Drawing air into exhaust system Secondary air backflow to the intake system

Were the battery terminals disconnected recently?Yes

After warming-up, let the engine run at idling for about 10 minutes.

No



No

Does idling speed fluctuate excessively?Yes

Check if hunting occurs.(Refer to P.13-48, INSPECTION PROCEDURE 40.)

No

Check the ISC servo for operation sound.NG

Check the ISC servo system.(Refer to P.13-44, INSPECTION PROCEDURE 33.)

OK

Check the injector for operation.NG

Check the injector system. (Refer to P.13-15, INSPECTION PRO-

CEDURE FOR DIAGNOSIS CODE 41.)OK

MUT-II: Check if idling speed is unstable.(Refer to P.13-49, INSPECTION PROCEDURE 41.)

OK

Check the ignition timing.(Refer to GROUP 11 Engine Adjustment.)*


OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the secondary air supply system. (Ensure that there is no back flow of secondary air into the intake system.) Check the compression pressure. Check if foreign materials (water, alcohol, etc.) got into fuel.



26/70



Idling speed is high. (Improper idling speed) Probable cause

In such cases as the above, the cause is probably that the intake air volume duringidling is too great.

Malfunction of the ISC servo system Malfunction of the throttle body

OK

MUT-IIData list26 Idle position switch (Refer to P.13-58.)

NGCheck the idle position switch system.(Refer to P.13-38, INSPECTION PROCEDURE 26.)

No



OK

MUT-IIData list21 Engine coolant temperature sensor (Refer to P.13-57.)

NGCheck the engine coolant temperature sensor system.(Refer to P.13-10, INSPECTION PROCEDURE FOR DIAGNOSISCODE 21.)

OK

MUT-IIData list28 A/C switch (Refer to P.13-58.)

NGCheck the A/C switch and A/C relay system.(Refer to P.13-39, INSPECTION PROCEDURE 29.)

OK

Basic idle speed adjustment (Refer to P.13-30.)*


Clean the throttle valve area.

Adjust the fixed SAS. (Refer to P.13-30.)*





27/70



Idling speed is low. (Improper idling speed) Probable cause

In cases such as the above, the cause is probably that the intake air volume duringidling is too small.

Malfunction of the ISC servo system Malfunction of the throttle body



No



OK



OK



OK

Basic idle speed adjustment (Refer to P.13-30.)*

Check trouble symptom. NG Clean the throttle valve area.

Adjust the fixed SAS. (Refer to P.13-30.)*



28/70



When the engine is cold, it stalls at idling. (Die out) Probable cause

In such cases as the above, the cause is probably that the air/fuel mixture is inappropriatewhen the engine is cold, or that the intake air volume is insufficient.

Malfunction of the ISC servo system Malfunction of the throttle body Malfunction of the injector system Malfunction of the ignition system

Were the battery terminals disconnected recently?

Yes

After warming-up, let the engine run at idling for about 10 minutes.No



OK

Check the fuel pressure. (Refer to P.13-30.)*

OK

Check the ignition timing.(Refer to GROUP 11 Engine Adjustments.)*


OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the compression pressure. Check the engine oil viscosity.

OK



OK

Check the injector for operation sound.NG

Check the injector system. (Refer to P.13-15, INSPECTION PRO-CEDURE FOR DIAGNOSIS CODE 41.)

Yes

Check the ISC servo for operation sound.

NG


No

Is engine-idling stable after the warming-up?No

Check for unstable idling (Rough idling, hunting).(Refer to P.13-25, INSPECTION PROCEDURE 8.)

No

Does the engine stall right after the accelerator pedal is released?Yes

Clean the throttle valvearea.

Adjust the fixed SAS.(Refer to P.13-30.)*

OK





29/70



When the engine is hot, it stalls at idling. (Die out) Probable cause

In such cases as the above, the cause is probably that ignition system, air/fuel mixture,idle speed control (ISC) or compression pressure is defective.In addition, if the engine suddenly stalls, the cause may also be a defective connectorcontact.

Malfunction of the ignition system Malfunction of air-fuel ratio control system Malfunction of the ISC servo system Drawing air into intake system Improper connector contact Backflow of secondary air to the intake system



No

MUT-IIDiagnosis codeAre diagnosis codes displayed?


No



OK

Check the injector for operation sound.NG


OK

Does the engine stall right after the accelerator pedal is released? Yes Clean the throttle valvearea.

Adjust the fixed SAS.(Refer to P.13-30.)*

No

Does the engine stall easily again?No

While carrying out an intermittent malfunction simulation test (Referto GROUP 00Points to Note for Intermittent Malfunctions.), checkfor sudden changes in the signals shown below. Crank angle sensor signal Injector drive signal Fuel pump drive signal Air flow sensor signal

Secondary ignition signal Engine-ECU power supply

voltage

Yes

MUT-II: Engine stalling inspection when the engine is warm andidling. (Refer to P.13-50, INSPECTION PROCEDURE 42.)

OK

Check the ignition timing.(Refer to GROUP 11 ENGINE ADJUSTMENTS.)*

NG

Check that the crank angle sensor and the timing belt cover areinstalled properly.

OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the secondary air supply system. (Ensure that there is no backflow of secondary air into the intake system.) Check if the injectors are clogged. Check the compression pressure. Check if foreign materials (water, alcohol, etc.) got into fuel.



30/70



The engine stalls when starting the car. (Pass out) Probable cause

In cases such as the above, the cause is probably misfiring due to a weak spark,or an inappropriate air/fuel mixture when the accelerator pedal is depressed.

Drawing air into intake system Malfunction of the ignition system



No

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check if air was drawn into the intake system.

Broken intake manifold gasketBroken or disconnected vacuum hoseImproper operation of the PCV valveBroken air intake hose


The engine stalls when decelerating. Probable cause

In cases such as the above, the cause is probably that the intake air volume is insufficientdue to a defective idle speed control (ISC) servo system.

Malfunction of the ISC servo system

No

MUT-IIData list26 Idle position switch (Refer to P.13-XX.)

NGCheck the idle position switch system.(Refer to P.13-XX, INSPECTION PROCEDURE 26.)

OK

MUT-IIData list14 Throttle position sensor (Refer to P.13-57.)

NGCheck the throttle position sensor system. (Refer to P.13-9, IN-SPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

OK

MUT-IIData list45 ISC servo position Is the idle speed control (ISC) servo position drops to 02

steps when decelerating (engine r/min less than 1,000)?

YesCheck the vehicle speed sensor system. (Refer to P.13-13, INSPEC-TION PROCEDURE FOR DIAGNOSIS CODE 24.)

No

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Clean the throttle valve area. Check and adjust the fixed SAS.

No



No






31/70



Hesitation, sag or stumble Probable cause

In cases such as the above, the cause is probably that ignition system, air/fuel mixtureor compression pressure is defective.

Malfunction of the ignition system Malfunction of air-fuel ratio control system Malfunction of the fuel supply system Poor compression Malfunction of the turbocharger system Malfunction of the secondary air supply system



No

Check the injectors for operation sound.NG


OK



OK

MUT-II: Check if hesitation, sag, stumble or poor accelerationoccurs. (Refer to P.13-51, INSPECTION PROCEDURE 43.)

OK


OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the turbocharger boost pressure. Check the boost pressure control system. Check the turbocharger turbine wheel for smooth rotation. Check the compression pressure. Check the fuel filter or fuel line for clogging. Check the secondary air supply system.



The feeling of impact or vibration when accelerating Probable cause

In cases such as the above, the cause is probably that there is an ignition leakaccompanying the increase in the spark plug demand voltage during acceleration.

Malfunction of the ignition system



No

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check for occurrence of ignition leak.


32/70



The feeling of impact or vibration when decelerating Probable cause

Malfunction of the ISC servo system is suspected. Malfunction of the ISC servo system



No



OK

MUT-IIData list14 Throttle position sensor (Refer to P.13-57.)

NGCheck the throttle position sensor system. (Refer to P.13-9, IN-SPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

OK



OK

Clean the throttle valve area.

INSPECTION PROCEDURE 18Poor acceleration Probable cause

Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc.are suspected.

Malfunction of the ignition system Malfunction of air-fuel ratio control system Malfunction of the fuel supply system Poor compression pressure Clogged exhaust system Malfunction of the turbocharger system



No

Check the injectors for operation sound.

NG

Check the injector system. (Refer to P.13-15, INSPECTION PRO-CEDURE FOR DIAGNOSIS CODE 41.)OK



OK

MUT-II: Check if hesitation, sag, stumble or poor acceleration occur.(Refer to P.13-51, INSPECTION PROCEDURE 43.)

OK


OK

Check the following items.

Check the ignition coil, spark plugs, spark plug cables. Check the turbocharger boost pressure. Check the boost pressure control system. Check the turbocharger turbine wheel for smooth rotation. Check the compression pressure. Check the fuel filter or fuel line for clogging. Broken air intake hose Clogged air cleaner Clogged exhaust system



33/70



Surge Probable cause

Defective ignition system, abnormal air-fuel ratio, etc. are suspected. Malfunction of the ignition system Malfunction of air-fuel ratio control system



No

Check the injectors for operation sound.NG


OK



OK

MUT-II: Check if surge occurs.(Refer to P.13-52, INSPECTION PROCEDURE 44.)

OK


OK

Check the following items. Check the ignition coil, spark plugs, spark plug cables. Check the waste gate actuator.



Knocking Probable cause

In cases as the above, the cause is probably that the detonation control is defectiveor the heat value of the spark plug is inappropriate.

Defective detonation sensor Inappropriate heat value of the spark plug



No

Does knocking occur when driving with the sensor disconnected?At this time, use the MUT-IIto check if the timing is retardedcompared to when the detonation sensor connector is con-nected.

NoCheck the detonation sensor system. (Refer to P.13-15, INSPEC-TION PROCEDURE FOR DIAGNOSIS CODE 31.)

Yes

Check the following items. Spark plugs Check if foreign materials (water, alcohol, etc.) got into fuel.


Dieseling Probable cause

Fuel leakage from injectors is suspected. Fuel leakage from injectors

Check the injectors for fuel leakage.


34/70



Too high CO and HC concentration when idling Probable cause

Abnormal air-fuel ratio is suspected. Malfunction of the air-fuel ratio control system Deteriorated catalyst


No



OK

MUT-IIData list21 Engine coolant temperature sensor. (Refer to P.13-57.)


OK

MUT-IIData list13 Intake air temperature sensor (Refer to P.13-56.)

NGCheck the intake air temperature sensor system. (Refer to P.13-9,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)

OK

MUT-II

Data list25 Barometric pressure sensor (Refer to P.13-58.)

NG

Check the barometric pressure sensor system. (Refer to P.13-14,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)

OK

MUT-IIData list11 Oxygen sensor

OK: 6001,000 mV when racing suddenly

NGCheck the oxygen sensor system. (Refer to P.13-15, INSPECTIONPROCEDURE FOR DIAGNOSIS CODE 31.)

OK

MUT-IIData list11 Oxygen sensor

OK: Repeat 0400 mV and 6001,000 mV alternately whenidling.

OK

NG


OK

NG

Check the following items. Check the injectors for operation sound. Check the injectors for fuel leakage. Check the ignition coil, spark plugs, spark plug cables. Check the compression pressure. Check the positive crankcase ventilation system. Check the evaporative emission control system.

Check the trouble symptom.

NG

Replace the catalytic converter.

Replace the oxygen sensor.





35/70



Low alternator output voltage (approx. 12.3 V) Probable cause

The alternator may be defective, or malfunctions, which are listed in the right column,may be suspected.

Malfunction of charging system Short circuit in harness between alternator G terminal

and engine-ECU Malfunction of engine-ECU

Measure at the alternator connectorside. A-05 Connect the connector.

(Test harness: MB991519) Voltage between 1 (black clip) and

earthEngine: at idleRadiator fan: does not runHeadlamp: OFF ONBrake lamp: OFF ONRear defogger switch:OFF ONOK: Voltages rises

by 0.2 3.5 V.

NGMeasure at the alternator connector.A-05 Disconnect the connector, and

measure at the harness side. Disconnect the engine-ECU con-

nector. Continuity between 1 and earth

OK: No continuity

NGCheck the harness wire between thealternator and the engine-ECU connec-tor, and repair if necessary.

OK

Check the alternator.

OK

Check the harness wire between thealternator and the engine-ECU connec-tor.

NGRepair

OK



Power supply system and ignition switch-IG system Probable cause

When an ignition switch ON signal is input to the engine-ECU, the engine-ECU turnsthe control relay ON. This causes system voltage to be supplied to the engine-ECU,injectors and air flow sensor.

Malfunction of the ignition switch Malfunction of the control relay Improper connector contact, open or short-circuited

harness wire Disconnected engine-ECU earth wire Malfunction of the engine-ECU

Check the control relay. (Refer to P.13-68.)NG

Replace

OK

Measure at the control relay connector B-27. Disconnect the connector, and measure at the harness side. Voltage between 3, 4 and earth

OK: System voltage

NG Check the followingconnector:A-28

NG Repair

OK


NG

Check the harness wire between battery and control relay connector,and repair if necessary.

OK

Check the engine-ECU power supply and earth circuit.(Refer to P.13-53, INSPECTION PROCEDURE 45.)


36/70



Fuel pump system Probable cause

The engine-ECU turns the control relay ON when the engine is cranking or running,and this supplies power to drive the fuel pump.

Malfunction of the fuel pump relay Malfunction of the fuel pump Improper connector contact, open or short-circuited

harness wire Malfunction of the engine-ECU

OK

Check the harness wire between resistor connector and fuel pumpdrive terminal and between fuel pump relay No.2 connector andfuel pump drive terminal, and repair if necessary.

OK

Check the resistor. (Refer to P.13-34.)*NG

Replace

OK

Measure at the resistor connector A-124. Disconnect the connector. Voltage between 1 and earth MUT-IIActuator test: Fuel pump relay No.2 drive

OK: System voltage

NGCheck the harness wire between fuel pump relay No.2 and resistorconnector, and repair if necessary.

OK

Measure at the engine-ECU connector B-60. Connect the connector. Voltage between 39 and earth MUT-IIActuator test: Fuel pump drive

OK: System voltage

NGCheck the harness wire between fuel pump relay No.2 andengine-ECU connector, and repair if necessary.

NGCheck the harness wire between fuel pump relay and fuel pumprelay No.2 connector, and repair if necessary.

OK

Measure at the fuel pump relay No.2 connector A-123. Disconnect the connector. Voltage between each of 3 and 5 and earth MUT-IIActuator test: Fuel pump drive

OK: System voltage

OK

Check the fuel pump relay No.2. (Refer to P.13-68)NG

Replace

OK

Check the following connectors:

D-18, D-04, B-64, A-124, A-123, B-59, B-60

NGRepair

OK

Measure at the fuel pump relay connector B-28. Connect the connector. Voltage between 1 and earth MUT-IIActuator test: Fuel pump drive

OK: System voltage

NGCheck the fuel pump drive control circuit.(Refer to P.13-54, INSPECTION PROCEDURE 47.)

OK

Check the fuel pump relay. (Refer to P.13-68.)NG

Replace

Check the fuel pump operation by applying the system voltageto the fuel pump drive terminal.

NGCheck the fuel pump circuit.(Refer to P.13-53, INSPECTION PROCEDURE 46.)



37/70



Fuel pump system Probable cause

The engine-ECU turns the fuel pump relay ON when the engine is cranking orrunning, and this supplies power to drive the fuel pump.

The engine-ECU supplies power to the fuel pump through the resistor at low loadoperations. It supplies power directly to the fuel pump at high load operationsto increase the pump output.

Malfunction of the fuel pump relay Malfunction of the fuel pump relay No.2 Malfunction of the fuel pump Malfunction of fuel pump resistor Improper connector contact, open or short-circuited

harness wire Malfunction of engine-ECU

OK

Check the fuel pump drive control circuit.(Refer to P.13-54, INSPECTION PROCEDURE 47.)

Check the harness wire between fuel pumprelay No.2 and fuel pump relay connector,and repair if necessary.

NGRepair

NG

OK


NG

Check the harness wire between fuel pump relay No.2 andengine-ECU connector, and repair if necessary.

OK


NG


OK


OK

Check the following connector: B-60NG

Repair

OK

Measure at the engine-ECU connector B-60. Disconnect the connector, and measure at the harness side. Voltage between 39 and earth

MUT-IIActuator test: 07 Fuel pumpOK: System voltage


NGRepair

NGCheck the harness wire between fuel pump resistor and fuel pumprelay connector, and repair if necessary.

OK

Measure at the fuel pump resistor connector A-124. Disconnect the connector, and measure at the harness side. Voltage between 1 and earth MUT-IIActuator test: 13 Fuel pump relay No.2

OK: System voltage

OK

Measure at the fuel pump relay No.2 connector A-123. Disconnect the connector, and measure at the harness side. Disconnect the fuel pump resistor connector. Voltage between each of 1 and 3 and earth MUT-IIActuator test: 07 Fuel pump drive

OK: System voltage

NGCheck the following connector: B-28

NGRepair

OK

Check the fuel pump relay No.2 and fuel pump resistor.(Refer to P.13-68.)

NGReplace

OK

Check the fuel pump relay. (Refer to P.13-68.)NG

Replace

Check the harness wire between fuel pump resistor and fuel pumpconnector, and repair if necessary.

OK

Perform fuel pump operation check. Disconnect the fuel pump resistor connector. Apply system voltage to terminal No.2 of the harness side

connector.OK: Fuel pump operates.

NG

Perform fuel pump operation check. Disconnect the fuel pump relay No.2 connector. Apply system voltage to terminal No.2 of the harness side

connector.OK: Fuel pump operates.

NGCheck the fuel pump circuit.(Refer to P.13-54, INSPECTION PROCEDURE 46.)


38/70



Idle position switch system Probable cause

The idle position switch inputs the condition of the accelerator pedal, i.e. whetherit is depressed or released (HIGH/LOW), to the engine-ECU.The engine-ECU controls the idle speed control servo based on this input.

Maladjustment of the accelerator cable Maladjustment of the fixed SAS Maladjustment of the idle position switch and throttle

position sensor Improper connector contact, open or short-circuited


Check the idle position switch. (Refer to P.13-30.)*NG

Replace the throttle position sensor.

OK

Measure at the throttle position sensor connector A-16. Disconnect the connector, and measure at the harness side. Voltage between 3 and earth (Ignition switch: ON)

OK: 4 V or higher Continuity between 4 and earth

OK: Continuity

NGCheck the followingconnector:B-62

NGRepair

OK


NG

Check the harness wire between engine-ECU and throttle positionsensor connector.

OK


NG

Repair

OK

Check the followingconnector:A-16

NGRepair

OK


NG




Ignition switch-ST system Probable cause

The ignition switch-ST inputs a HIGH signal to the engine-ECU while the engine iscranking.

The engine-ECU controls fuel injection, etc. during starting based on this input.

Malfunction of ignition switch Improper connector contact, open or short-circuited


Measure at the engine-ECU connector B-62. Disconnect the connector, and measure at the harness side.1. Voltage between 71 and earth (Ignition switch: START)

OK: 8V2. Continuity between 91 and earth

OK: Continuity

1. NGCheck the followingconnector:B-64

NGRepair

OK


NG

Check harness wire be-tween the engine-ECUand ignition switch con-nector.

NGRepair

OK

Check the ignition switch.

2. NG

Check the harness wire between engine-ECU connector (terminalNo.91) and earth, and repair if necessary.

OK

Check the followingconnector:B-62

NGRepair

OK


NG



39/70



Power steering fluid pressure switch system Probable cause

The presence or absence of power steering load is input to the engine-ECU.The engine-ECU controls the idle speed control (ISC) servo based on this input.

Malfunction of power steering fluid pressure switch Improper connector contact, open or short-circuited


Check the power steering fluid pressure switch.

NG

ReplaceOK

Measure at the power steering fluid pressure switch connectorA-101. Disconnect the connector, and measure at the harness side. Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

NGCheck the followingconnectors:A-28, B-60

NGRepair

OK


NG

Check harness wire be-tween engine-ECU andpower steering fluid pres-sure switch connector.

NGRepair

OK


OK

Check the followingconnector:A-101

NGRepair

OK


NG



A/C switch and A/C relay system Probable cause

When an A/C ON signal is input to the engine-ECU, the engine-ECU carries outcontrol of the idle speed control (ISC) servo, and also operates the A/C compressormagnetic clutch.

Malfunction of A/C control system Malfunction of A/C switch Improper connector contact, open or short-circuited


Check the A/C compressor relay.(Refer to GROUP 55 On-vehicle Service.)

NGReplace

OK

Measure at the engine-ECU connectors B-59, B-60. Disconnect the connector, and measure at the harness side. Voltage between 22 and earth, and 45 and earth

(Ignition switch: ON, A/C switch: ON)OK: System voltage

Short-circuit between 22 and earth(Ignition switch: ON, A/C switch: ON)OK: A/C compressor clutch turns on.

NGCheck the A/C system. (Refer to GROUP 55On-vehicle Service.)

OKCheck the followingconnectors:B-59, B-60

NGReplace

OK


NG



40/70



Fan motor relay system (Radiator fan, A/C condenser fan) Probable cause

The engine-ECU turns on/off the built-in power transistor to control the fan motorrelay.

Malfunction of the fan motor relay Malfunction of the fan motor Improper connector contact, open or short-circuited


NG

Check the radiator fan circuit. Check the A/C condenser fan circuit.

(Refer to Electrical Wirings.)

NG


OK


Measure at the engine-ECU connector B-59. Disconnect the connector, and measure at the harness side. Voltage between each of 20 and 21 and earth


Short the terminal 21 to earth.(Ignition switch: ON)OK: Fan operates at low speed.

Short the terminals 20 and 21 to earth.(Ignition switch: ON)OK: Fan operates at high speed.

OK Check the following connector: B-59 NG Repair


41/70



Fan motor relay system (Radiator fan, A/C condenser fan) Probable cause

The engine-ECU turns on/off the built-in power transistor to control the fan motorrelay.

Malfunction of the fan motor relay Malfunction of the fan motor Malfunction of thermostat Improper connector contact, open or short-circuited


NG

Check the engine coolant temperature sensor. (Refer to P.13-10,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)

OK


NG

MUT-IIData list21 Engine coolant temperature sensor

OK: The engine coolant temperature agrees with the readingof MUT-IIwhen measured with the engine idling in warmcondition.

OKCheck the thermostat.

NGReplace

OK


OK


Repair

NGCheck the A/C condenser fan circuit. (Refer to Electrical Wirings.)

NG

Measure at the engine-ECU connector B-60. Disconnect the connector, and measure at the harness side. Check the A/C condenser fan for operating condition.

(Ignition switch: ON)OK: A/C condenser fan is stationary.

Voltage between each of 32 and 34 and earth(Ignition switch: ON)OK: System voltage

Short the terminal 32 to earth. (Ignition switch: ON)OK: A/C condenser fan operates at high speed.

Short the terminal 34 to earth. (Ignition switch: ON)OK: A/C condenser fan operates at low speed.


OK

OK

Check the following connector: B-59 NG Repair

Measure at the engine-ECU connector B-59. Disconnect the connector, and measure at the harness side. Check the radiator fan for operating condition.

(Ignition switch: ON)OK: Radiator fan is stationary.

Voltage between each of 20 and 21 and earth(Ignition switch: ON)OK: System voltage

Short the terminal 20 to earth.(Ignition switch: ON)OK: Radiator fan operates at high speed.

Short the terminal 21 to earth.(Ignition switch: ON)OK: Radiator fan operates at low speed.

NGCheck the radiator fan circuit. (Refer to Electrical Wirings.)


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Oxygen sensor system Probable cause

When CO or HC concentration is too high, the malfunction of the parts shown atright may be the cause. The oxygen sensor detects the density of oxygen in exhaust gas and inputs it

to the engine-ECU after converting into a voltage signal. The engine-ECU controls the fuel injection amount based on this signal such that

the stoichiometric air/fuel mixture ratio can be obtained.

Malfunction of oxygen sensor Improper connector contact, open or short-circuited


OK


Check the harness wire betweenengine-ECU and oxygen sensor connector.

NGRepair

NG

OK


OK


NG

Check the harness wire betweenengine-ECU and oxygen sensor connector.

NGRepair

OK


OK

Check the following connector: A-63NG

Repair

OK

Measure at the oxygen sensor connector A-63. Disconnect the connector, and measure at the harness side. Continuity between 2 and earth

OK: Continuity

NGCheck the following connector: B-62

NGRepair

Check the oxygen sensor. (Refer to P.13-32.)*NG

Replace



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Ignition circuit system Probable cause

The engine-ECU interrupts the ignition coil primary current by turning the power transistorinside the engine-ECU ON and OFF.

Malfunction of ignition switch. Improper connector contact, open or short-circuited


Measure at the ignition coil connectors A-110, A-111. Disconnect the connector and measure at the harness side.1. Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage2. Continuity between 2 and earth

OK: Continuity

1. NG

Check the followingconnectors:B-65, B-76

NG

Repair

OK


NG

Check the harness wirebetween ignition coil andignition switch connector.

NGRepair

OK

Check the ignition switch.

2. NG

Check the harness wire between ignition coil connector and earth,

and repair if necessary.

OK

Check the followingconnectors:

A-110, A-111

NGRepair

OK


Check ignition coil and power transistor unit system. (Refer toP.13-16, INSPECTION PROCEDURE FOR DIAGNOSIS CODE44.)


Idle speed control (ISC) servo (Stepper motor) system Probable cause

The engine-ECU controls the intake air volume during idling by opening and closingthe servo valve located in the bypass air passage.

Malfunction of ISC servo Improper connector contact, open or short-circuited


Check the ISC servo.NG

Replace

OK

Measure at the ISC servo connector A-18. Disconnect the connector and measure at the harness side. Voltage between 2 and earth, and 5 and earth (Ignition switch:

ON)OK: System voltage

NGCheck the harness wire between control relay and ISC servo con-nector, and repair if necessary.

OK

Measure at the engine-ECU connector B-59. Disconnect the connector, measure at the harness side. Voltage between each of 4, 5, 17, 18 and earth (Ignition switch:

ON)

OK: System voltage

NGCheck the followingconnector:A-18

NGRepair

OK


Check harness wire between engine-ECU and ISC servo connector,and repair if necessary.

OK

Check the followingconnector:B-59

NGRepair

OK




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Fuel pressure control valve system Probable cause

The fuel pressure control valve switches the pressure introduction into the fuel pressureregulator between the intake manifold and atmosphere.

Malfunction of solenoid valve Improper connector contact, open or short-circuited


NGReplace the engine-ECU.

OK


NG

Check the harness wire between engine-ECU and solenoid valveconnector, and repair if necessary.

OK


OK

Check the following connector: B-59 NG Repair

OK



NGCheck the following connector: A-12

NGRepair

NGCheck the harness wire between control relay and solenoid valveconnector, and repair if necessary.

OK

Measure at the fuel pressure control valve connector A-12. Disconnect the connector, and measure at the harness side. Voltage between 1 and earth


Check the fuel pressure control valve.

NG

Replace


Waste gate solenoid valve Probable cause

The waste gate solenoid valve controls the boost pressure introduced into the wastegate actuator in the turbocharger.




OK


NG


OK


OK


Repair

OK




NGRepair

NGCheck the harness wire between control relay and solenoid valveconnector, and repair if necessary.

OK

Measure at the waste gate solenoid valve connector A-23. Disconnect the connector, and measure at the harness side. Voltage between 2 and earth


Check the waste gate solenoid valve.(Refer to Group 15 On-vehicle service.)*

NG Replace



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Secondary air control solenoid valve system Probable cause

The secondary air control solenoid valve switches the pressure introduction into thesecondary air valve between the intake manifold and atmosphere.




OK


NG


OK


NG

Check the harness wire between control relay and solenoid valveconnector, and repair if necessary.

OK


OK


Repair

OK

Measure at the engine-ECU connector B-59. Disconnect the connector, and measure at the harness side.

Voltage between 6 and earth(Ignition switch: ON)OK: System voltage

NGCheck the following connectors:A-127, A-88

NGRepair

OK

Measure at the secondary air control solenoid connector A-127. Disconnect the connector, and measure at the harness side. Voltage between 1 and earth



NGRepair

Check the secondary air control solenoid valve.(Refer to Group 15 INTAKE AND EXHAUST.)*

NG

Replace



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MUT-II: Inspection of no initial combustion

MUT-IIData list16 engine-ECU power supply voltage (Refer to P.13-57.)

NGCheck the power supply and ignition switch-IG system.(Refer to P.13-35, INSPECTION PROCEDURE 24.)

OK

Does the camshaft rotate at the engine cranking?(When oil filler cap is removed.)

NoCheck timing belt for breakage.

Yes



No

MUT-IIData list22 Crank angle sensor

OK: Cranking speed is displayed.

NGCheck the crank angle sensor system.(Refer to P.13-11, INSPECTION PROCEDURE FOR DIAGNOSISCODE 22.)

OK

MUT-IIActuator test07 Fuel pump (Refer to P.13-61.)

NGCheck the fuel pump system.(Refer to P.13-36, INSPECTION PROCEDURE 25.)

OK




Ignition system: Inspection of no initial combustion.

OK


NG Check that the crank angle sensor and the timing belt cover areinstalled properly.

NGCheck the ignition circuit system.(Refer to P.13-44, INSPECTION PROCEDURE 32.)

Check by connecting a timing light to the spark plug cable.OK: Timing light flashes during cranking.

Comprobaciones en Inyeccion

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Transcript of Comprobaciones en Inyeccion